Okay, I did some test shots with the Nikon 5000 and the SB-28 via hot shoe. Most of these shots are tend to a little overexposure. I made some adjustments and the results look very good. Here are at least something you can do:

use bounce flash as much as possible when you take picture in door, remember the rule of thumb, turn on all the available lights, that will help to minimize the red eyes problem.

set the zoom head the the widest angel, use the defuser that comes with the flash when shooting with the flash pointing direct to the subject.

when shooting close-up or marco, use the white paper towel to cover the flash head (use rubber band to secure), depending on how close, you can fold the paper towel in the double, or triple or...more... you will have a very pleasant results (soft lighting).

Try it folks, it's fun to play experience, if you have other tips, please share with us...